Tephrology (part 2) : Simultaneity of tephra deposition
نویسندگان
چکیده
منابع مشابه
Preservation of thin tephra
The preservation of thin (<300 mm thick) tephra falls was investigated at four sites in Papua New Guinea (PNG), Alaska and Washington, USA. Measurements of the variations in the thickness of: (i) Tibito Tephra 150 km downwind from the source, Long Island (PNG) erupted mid-seventeenth century; (ii) St Helens W tephra (erupted 1479–80 A.D.) on the slopes of the adjacent Mt. Rainier in Washington ...
متن کاملThe effects of fire and tephra deposition on forest vegetation in the Central Cascades, Oregon
a r t i c l e i n f o High-resolution charcoal and pollen analyses were used to reconstruct a 12,000-yr-long fire and vegetation history of the Tumalo Lake watershed and to examine the short-term effects that tephra deposition have on forest composition and fire regime. The record suggests that, from 12,000 to 9200 cal yr BP, the watershed was dominated by an open Pinus forest with Artemisia as...
متن کاملThe spatial extent of tephra deposition and environmental impacts from the 1912 Novarupta
6 The eruption of Novarupta within the Katmai Volcanic Cluster, south-west Alaska, in June 1912 was the 7 most voluminous eruption of the 20 Century but the distal distribution of tephra deposition is 8 inadequately quantified. We present new syntheses of published tephrostratigraphic studies and a large 9 quantity of previously un-investigated historical records. For the first time we apply a ...
متن کاملPart 13.-Theory of Multilayer Deposition
A model is developed to describe multilayer deposition in packed-bed systems. The multilayer deposition is significant for colloid suspensions which are near or beyond the critical coagulation conditions. Packed-bed deposition studies of such suspensions are possible in experiments with short residence times. Our model is formulated along the lines of the existing monolayer theories and involve...
متن کاملUniqueness of Simultaneity
We consider the problem of uniqueness of certain simultaneity structures in flat spacetime. Absolute simultaneity is specified to be a nontrivial equivalence relation which is invariant under the automorphism group Aut of spacetime. Aut is taken to be the identity-component of either the inhomogeneous Galilei group or the inhomogeneous Lorentz group. Uniqueness of standard simultaneity in the f...
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ژورنال
عنوان ژورنال: The Quaternary Research (Daiyonki-Kenkyu)
سال: 2014
ISSN: 0418-2642,1881-8129
DOI: 10.4116/jaqua.53.111